Dictionary definition · thumb
noun
- the thick short innermost digit of the forelimb
- the part of a glove that provides a covering for the thumb
- a convex molding having a cross section in the form of a quarter of a circle or of an ellipse
verb
- travel by getting free rides from motorists
- look through a book or other written material"He thumbed through the report"
- feel or handle with the fingers"finger the binding of the book"
Source: Open English WordNet (CC BY 4.0).